Question about 2000 GMC New Sierra 1500
Yes bad o-ring seal in the fuel pressure regulator could be the problem causing the loss of fuel pressure. Also bad o-rings on injectors can also cause loss of fuel pressure.Also check the FPR itself.If fuel pressure regular is faulty,then also there will be loss of fuel pressure. Also check for leak at injectors:-- What you do to check for an injector leak is pressurize your fuel system (key on) with a fuel pressure guage attached to the service port. Then close both valves on the return and feed block off lines and monitor your guage. If the system keeps pressure you know that injectors are ok and the problem may be down stream (fuel pump or fpr). On the flip side, if it didn't hold pressure then it could be an injector or an fpr leaking into the vacuum line. To check the fuel pump, presurize the fuel system and only block off only the return line. If it holds pressure then you know the the fuel pump is ok and the problem may be with the fpr. If you loose pressure, the pump check valve is bad and you need a fuel pump. To check the fpr, pressurize the system and then block off only the feed line. If the system holds pressure then the fpr is ok. If you loose pressure then the fpr is allowing fuel to pass into the return line. In that case you have a bad fpr. ------------ Try this tests and possibilities to confirm the fault.This should help.Thanks.Helpmech.
Posted on Jan 02, 2011
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Posted on Jan 02, 2017
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